virt: tdx-guest: Add a helper for the Quote buffer size

The Quote buffer size is a constant sprinkled across several places.
Read it from a helper instead. And rename the constant to avoid using a
verb.

This sets up the plumbing for a later change that makes the size
dynamic.

There are several "sizes" at play here: the raw Quote data, the Quote
buffer (the header metadata plus the raw data), and the allocation (the
page-padded Quote buffer). The helper returns the Quote buffer size and
leaves page alignment to callers that need it.

AI was used under supervision to collect/apply feedback, review code and
workshop logs.

Signed-off-by: Peter Fang <peter.fang@intel.com>
Signed-off-by: Dave Hansen <dave.hansen@linux.intel.com>
Link: https://patch.msgid.link/20260930103739.2851980-5-peter.fang@intel.com

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